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92 lines
2.8 KiB
Ruby
92 lines
2.8 KiB
Ruby
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#!/usr/bin/env ruby
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###############################################################################
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## http://www.6502.org/tutorials/6502opcodes.html
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## This web page has information about each and every 6502 instruction
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## Specifically:
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##
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## - Description of what each of the instructions do
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## - Which modes are supported by which instructions, immediate, zero page
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## zero page x, and y, absolute, indirect, relative etc.
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## - The hex codes each instruction assembles to, in each mode.
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## - The lengths in bytes of each instruction, by mode
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## - The possibly variable number of cycles each instruction takes.
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##
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## There are 56 of them, and in my programmer laziness I just wrote this
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## script to parse the page into the data structure that you see in
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## opcodes.yaml. This really helped in creating the assembler, and
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## it had basically everything I needed to know, and sped up writing
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## this by huge factor. So, yay to this page, and this script!
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require 'yaml'
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## Instruction name, and output structure to fill in.
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name = :adc
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output = {name => {}}
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## Copy paste the tables from that website into this heredoc:
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text =<<-TEXT
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Immediate ADC #$44 $69 2 2
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Zero Page ADC $44 $65 2 3
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Zero Page,X ADC $44,X $75 2 4
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Absolute ADC $4400 $6D 3 4
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Absolute,X ADC $4400,X $7D 3 4+
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Absolute,Y ADC $4400,Y $79 3 4+
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Indirect,X ADC ($44,X) $61 2 6
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Indirect,Y ADC ($44),Y $71 2 5+
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TEXT
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## And now iterate over each line to extract the info
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lines = text.split(/\n/)
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lines.each do |line|
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## Grab out the values we care about
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parts = line.split
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cycles, len, hex = parts[-1], parts[-2], parts[-3]
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hex = "0x%X" % hex.gsub('$', '').to_i(16)
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match_data = cycles.match(/([0-9]+)(\+?)/)
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cycles = match_data[1]
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boundary = match_data[2]
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hash = {:hex => hex, :len => len, :cycles => cycles, :boundry_add => boundary != ""}
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## And now decide which mode the line belongs to, collecting each listed mode
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hash = case line
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when /^Accumulator/
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{:accumulator => hash}
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when /^Immediate/
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{:immediate => hash}
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when /^Zero Page,X/
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{:zero_page_x => hash}
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when /^Zero Page,Y/
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{:zero_page_y => hash}
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when /^Zero Page/
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{:zero_page => hash}
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when /^Absolute,X/
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{:absolute_x => hash}
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when /^Absolute,Y/
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{:absolute_y => hash}
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when /^Absolute/
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{:absolute => hash}
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when /^Indirect,X/
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{:indirect_x => hash}
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when /^Indirect,Y/
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{:indirect_y => hash}
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when /^Indirect/
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{:indirect => hash}
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when /^Implied/
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{:implied => hash}
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else
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{}
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end
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output[name].merge!(hash)
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end
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## Now output some yaml, and I only had to do this about 45 times
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## instead of laboriously and mistak-pronely doing it by hand.
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puts YAML.dump(output).gsub("'", '')
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## See opcodes.yaml
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